S.C. Code Ann. § 59-25-420
Any teacher who is reemployed by written notification pursuant to Section 59-25-410 shall by April twenty-fifth first notify the board of trustees in writing of his acceptance of the contract. Failure on the part of the teacher to notify the board of acceptance within the specified time limit shall be conclusive evidence of the teacher's rejection of the contract.
Any teacher, receiving a notice that he will not be reemployed for the ensuing year, shall have the same notice and opportunity for a hearing provided in subsequent sections for teachers dismissed for cause during the school year.